Using the QRP Power Amplifier

If you hear an AC hum on the transmitted signal, usual causes are RF getting back into the power supply or a bad VSWR on the antenna.

These short checks in no way detail any and all problems that can rear their ugly head, but should get you on the way to solving most errors. We'd like to be able to foresee a problem a builder may encounter, but the sheer number of parts and the permutations and combinations of installing them makes any list of precise, exact solutions impossible. If you run into a roadblock, gather all your thoughts and information and give a call to the factory for some help. If you elect to enlist the help of a local expert, great...but be sure the expert is qualified (no need for having someone lead you down the wrong path)! Remember: You may always return the kit for factory service, and there's no charge if the problem is our fault. See the warranty on the last page of this manual.

Hooking up and using the amplifier is easy: Just connect your existing transmitter to the QAMP input and the antenna to the QAMP output. A resonant antenna is an absolute requirement for QRP operation, and an amplifier is not a "band-aid" for a poor antenna system!

For maximum performance, a QRP station must include the following:

1A resonant antenna (dipole or quarter-wave vertical);

2Good quality coaxial feedline and connectors;

3An effective earth ground.

We cannot expect good results from low levels of RF output if the power gets wasted in lousy coax, corroded connections, or poor antennas.

If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do. A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device. The whole idea of a QRP station is to keep things simple and economical, so we cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna.

ENCLOSURE RECOMMENDATIONS

Your finished amplifier can be installed in a variety of enclosures of your own design and choosing. You might be planning to combine several Ramsey circuit kit boards in a single enclosure. Use of the inexpensive and attractive Ramsey case and hardware set will give your unit that nice finished look and increase its resale value. These sturdy black instrument cases are supplied with neatly lettered front and rear panels, switch knobs, rubber feet and mounting screws.

QAMP-30 • 16

QAMP30 specifications

Ramsey Electronics QAMP30 is a versatile audio amplifier designed for a range of audio applications. This compact yet powerful amplifier is specifically engineered to provide quality sound in a small footprint, making it ideal for home audio systems, portable audio setups, and compact installations.

One of the main features of the QAMP30 is its robust 30-watt per channel output, delivering clear and dynamic sound that can fill a room. Its solid state design ensures reliability and durability, making it suitable for both casual listeners and audiophiles. The amplifier supports continuous operation, allowing users to enjoy music for extended periods without worrying about overheating or performance degradation.

In terms of connectivity, the QAMP30 is equipped with multiple input options. It includes RCA inputs for easy connection to various audio sources, such as televisions, DVD players, and computers. This flexibility allows users to integrate the amplifier seamlessly into their existing audio setups. Additionally, the amplifier features a 3.5mm auxiliary input, further expanding its compatibility with portable devices like smartphones and tablets.

The QAMP30 also incorporates advanced circuit design technologies to enhance audio performance. Its low noise floor and high signal-to-noise ratio ensure that audio playback is clean and free from unwanted distortion. This feature is particularly important for critical listening environments where audio fidelity is paramount.

Moreover, the QAMP30 has an integrated volume control knob, giving users direct access to adjust their listening levels easily. The simple, user-friendly interface and compact design permit versatile placement in various setups, whether on a shelf, desk, or installed within a larger audio system.

Furthermore, the amplifier is equipped with built-in protection features, such as thermal overload and short-circuit protection, safeguarding the device and connected audio equipment from damage. The overall build quality of the QAMP30 reflects Ramsey Electronics' commitment to producing reliable and effective audio products.

In summary, Ramsey Electronics QAMP30 is a compact, powerful audio amplifier featuring 30 watts per channel output, multiple input options, advanced circuit technologies, and built-in protection features. Its user-friendly design and high-performance characteristics make it an excellent choice for anyone looking to enhance their audio experience.